Rat-dos
When I first started playing Magic Arena, I discovered the (once-per-turn but technically infinite) combo of Mad Ratter and Priest of the Forgotten Gods and fell in love with Rakdos. This is my attempt to make a Rakdos sacrifice list that focuses on making and sacrificing rat tokens of all kinds. I had debated making a more streamlined Relentless Rats or Rat Colony deck, but decided to commit to the jank (also those rats are expensive). This deck often comes out fast and strong, establishes itself as the archenemy of the table, then peters out to lose embarassingly. That said, if you ever manage to get just the right combination of sacrifice fodder, enablers, and outlets, you'll quickly wind up with a game winning jank combo. Oh and of course, the whole deck has a subtheme of stealing other people's creatures to make for sac fodder.

Creatures (32)
1 Ayara, First of Locthwain1 Burglar Rat
1 Captivating Crew
1 Carrion Feeder
1 Chittering Witch
1 Drainpipe Vermin
1 Harried Spearguard
1 Judith, the Scourge Diva
1 Juri, Master of the Revue
1 Kroxa, Titan of Death's Hunger
1 Lord Skitter, Sewer King
1 Lord Skitter's Butcher
1 Mad Ratter
1 Mayhem Devil
1 Midnight Reaper
1 Mirkwood Bats
1 Mortician Beetle
1 Ogre Chitterlord
1 Ogre Slumlord
1 Pack Rat
1 Piper of the Swarm
1 Pitiless Plunderer
1 Priest of Forgotten Gods
1 Rancid Rats
1 Ruin Rat
1 Shrapnel Slinger
1 Smelt-Ward Ignus
1 Stronghold Rats
1 Typhoid Rats
1 Viscera Seer
1 Voracious Vermin
1 Zulaport Cutthroat
Sorceries (15)
1 Act of Treason1 Awaken the Sleeper
1 Blood Divination
1 Bone Shards
1 Bone Splinters
1 Claim the Firstborn
1 Eaten Alive
1 Furnace Reins
1 Kari Zev's Expertise
1 Merciless Resolve
1 Song of Totentanz
1 Spark Harvest
1 Traitorous Blood
1 Twisted Fealty
1 Wrangle
Instants (7)
1 Blood for the Blood God1 Corrupted Conviction
1 Gnawing Crescendo
1 Merciless Resolve
1 Not Dead After All
1 Rat Out
1 Village Rites
Artifacts (7)
1 Arcane Signet1 Ashnod's Altar
1 Rakdos Signet
1 Skullclamp
1 Sol Ring
1 Vat of Rebirth
1 Witch's Cauldron
Lands (35)
1 Akoum Refuge1 Bloodfell Caves
1 Bojuka Bog
1 Cinder Barrens
1 Command Tower
1 Dragonskull Summit
1 Evolving Wilds
1 Foreboding Ruins
1 Fountainport
1 Geothermal Bog
1 High Market
1 Mortuary Mire
7 Mountain
1 Rakdos Carnarium
1 Rogue's Passage
1 Shadowblood Ridge
1 Smoldering Marsh
9 Swamp
1 Tainted Peak
1 Terramorphic Expanse
1 Witch's Cottage